Good food: The panel discusses how fighting for a just food system can greatly benefit individual communities and the world at large. Speakers include Nick Saul (The Stop). [6:30 p.m., Commonwealth Club, 595 Market St., S.F.]

Gary Kamiya: The author of “Cool Gray City of Love: 49 Views of San Francisco,” in conversation with journalist Mark Hertsgaard, talks about San Francisco’s hidden history. [6 p.m., Commonwealth Club, 595 Market St., S.F.]

Polish theater: Studium Teatralne from Poland presents “The King of Hearts Is Off Again,” a play based on a fact-inspired Hannah Krall novel about a young Jewish woman in the Warsaw ghetto. [8 p.m., 2840 Mariposa St., S.F.]